Configuring PuTTY to use a SSH key
This gude will show you how to use your private key with putty when logging into a server that has your public key installed on it. This guide assumes you already know what PuTTY is and how to use it to connect to a server.
To select your key for use first expand out the "SSH" item in the "Category" tree.
Select, not expand, the "Auth" item under the expanded "SSH" category.
Click the "Browse" button and select your private key.